Global Volcanism Program | Image GVP-05662
A pyroclastic flow deposit from the 1929 eruption of Komagatake volcano, on the northern Japanese island of Hokkaido, overlies a brown pre-eruption surface. The upper part of the deposit contains large pumice that lacks fine-grained material between the clasts and the underlying unit is enriched in fine-grained material. A geological hammer provides scale.
Photo by Shinji Takarada, 1992 (Geological Survey of Japan).